| With the increasing development of society and economy, coal energy hasbecome an important pillar of the national economy. In the development andutilization of coal resources, we should fully improve its efficiency, vigorouslydevelop clean coal technologies and applications. It inevitably produces sulfur-containing gases during the development and utilization of these technologies,these gases not only pollute the environment, impact the industrial costs, but alsoharmful to human health, so it is essential for the removal of sulfur-containinggases. Because of their high energy efficiency, environmental friendliness, etc.,high-temperature gas desulfurization and regeneration processes becomepotential and necessary process of integrated gasification combined cycle powergeneration (IGCC), fuel cell power generation (FC) and coal poly generation(CPG) technologies. A necessary condition for high temperature gasdesulfurization agent can be commercialize is that it must be able to withstandhundreds of recycling, this requires not only a good desulfurization performancebut also have a good regeneration properties, therefore, high-temperature coal gasdesulfurizer regeneration process is one of the key steps during its recycledprocess.Based on the previous works, this paper discussed the fixed-bed dynamicbehavior of iron-based high temperature coal gas desulfurizer during theregeneration process in O2、SO2and O2-SO2collaborative atmosphere. The inletand outlet gas concentrations of fixed-bed were detected by gas chromatography and flue gas analyzer. Using fast intelligent sulphur analyzer for analysis of sulfurcontent at different times in different locations on the solid particles.①Theeffects of initial concentration, operating temperature and other factors on theregeneration process breakthrough curve and solid sulfur distribution in O2、SO2and O2-SO2collaborative atmosphere were studied. According to theexperimental results calculated the height of the reaction zone and the reactionzone movement speed at different operating conditions and atmosphere.Experimental results show that, the changes of reactants concentration has asignificant impact on the regeneration performance under different atmospheres.According to the solid sulfur content analysis it can be seen that the height ofreaction zone decreases, while the movement speed of the reaction zone increaseswith increasing concentration in O2atmosphere, this process can be explained bythe plug flow model. The reaction zone height and the moving speed increasedwith the increase of concentration, and the reaction zone height also increase withthe time extended in SO2atmosphere. This process is similar to the Topsoe sulfurdistribution curve, and it is quite different from the plug flow model. Theregeneration under O2-SO2collaborative atmosphere, the initial stage of thereaction is substantially O2reaction zone, the sulfur distribution can be consideredas S-type curve. Sulfur distribution curves appear two or more platforms with theextension of the regeneration time, the first platform mainly because ofsuperimposed between O2and SO2reaction zone, and increasing the reaction gasconcentration can reduce the height of first platform, it makes the superimposedreaction zone height decreases. The second platform and its above was mainly thereaction zone of SO2, it is similar to the single regeneration atmosphere containingSO2. Increase concentration of inlet gas can decrease the superimposed reactionzone height, but increase the movement speed.②Temperature changes has littleeffect on regeneration curve in O2atmosphere, but it has significant effect on SO2 regeneration curve. Under the experimental temperature, Elevated temperature,SO2atmosphere regeneration reaction zone height is reduced, and the movementspeed increased. It has the same effect between collaborative and singleatmosphere. The regeneration time is shortened, and the bed utilization increasedwith the temperature increased. |
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